Electrochemical functionalization of multi-walled carbon nanotubes for solvation and purification

Eugen Unger, Andrew Graham, Franz Kreupl, Maik Liebau, Wolfgang Hoenlein

Research output: Contribution to journalArticlepeer-review

139 Scopus citations


The chemical modification of multi-walled carbon nanotubes using electrolysis is described. It is found that the evolution of the halogens chlorine or bromine on an anode made from a foil of carbon nanotubes couples halogen atoms to the nanotube lattice. Furthermore, oxygen bearing functional groups, such as hydroxyl and carboxyl groups, are formed at the same time aiding solvation of the nanotubes in water or alcohol without any surfactant. Impurities and low grade modified nanotubes remain insoluble. The halogenated carbon nanotubes can be converted with sodium amide or triphenylmethyllithium to add the corresponding functional groups.

Original languageEnglish
Pages (from-to)107-111
Number of pages5
JournalCurrent Applied Physics
Issue number2
StatePublished - 2002
Externally publishedYes


  • Derivatisation
  • Electrochemical oxidation
  • Halogen addition
  • Multiwalled nanotubes
  • Purification


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